[PATCH 0/4]: Picture aspect ratio support in DRM layer

Shashank Sharma
2016-08-03T10:56:24Z

This patch series adds 4 patches.
- The first two patches add aspect ratio support in DRM layes
- Next two patches add new aspect ratios defined in CEA-861-F
supported for HDMI 2.0 4k modes.

Adding aspect ratio support in DRM layer:
- The CEA videmodes contain aspect ratio information, which we
parse when we read the modes from EDID. But while transforming
user_mode to kernel_mode or viceversa, DRM layer lose this
information.
- HDMI compliance testing for CEA modes, expects the AVI info frames
to contain exact VIC no for the 'video mode under test'. Now CEA
modes have different VIC for same modes but different aspect ratio
for example:
VIC 2 = 720x480@60 4:3
VIC 3 = 720x480@60 16:9
In this way, lack of aspect ratio information, can cause wrong VIC
no in AVI IF, causing HDMI complaince test to fail.
- This patch set adds code, which embeds the aspect ratio information
also in DRM video mode flags, and uses it while comparing two modes.

Adding new aspect ratios for HDMI 2.0
- CEA-861-F defines two new aspect ratios, to be used for 4k HDMI 2.0
modes.
- 64:27
- 256:135
Last two patches in the series, adds code to handle these new
aspect ratios.

Shashank Sharma (4):
drm: add picture aspect ratio flags
drm: Add aspect ratio parsing in DRM layer
video: Add new aspect ratios for HDMI 2.0
drm: Add and handle new aspect ratios in DRM layer

drivers/gpu/drm/drm_modes.c | 43 +++++++++++++++++++++++++++++++++++++++++++
drivers/video/hdmi.c | 4 ++++
include/linux/hdmi.h | 2 ++
include/uapi/drm/drm_mode.h | 24 +++++++++++++++++++-----
4 files changed, 68 insertions(+), 5 deletions(-)

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1.9.1